17、Which two statements are true about tablespaces?
A) A database can contain multiple undo tablespaces.
B) A database can contain only a single temporary tablespace.
C) A database instance stores undo data In the SYSTEM tablespace If no undo tablespace exists.
D) A database instance hangs If the SYSAUX tablespace becomes unavailable.
E) A database with a locally managed SYSTEM tablespace can have dictionary-managed user tablepaces.
Answer:AE
原文：https://www.cnblogs.com/cnblogs5359/p/9353972.html